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Tests show that Gold-Copper-Nickel alloy is compatible with ammonia systems. Joining tubes by brazing has advantages such as reducing chances of excessive grain growth in base metal, saving weight, and cleanliness.
NiAu2Cu crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two NiAu2Cu ribbons oriented in the (1, 0, 0) direction. Ni1+ is bonded in a linear geometry to two equivalent Au1- atoms. Both Ni–Au bond lengths are 2.42 Å. Au1- is bonded in a linear geometry to one Ni1+ and one Cu1+ atom. The Au–Cu bond length is 2.44 Å. Cu1+ is bonded in a linear geometry to two equivalent Au1- atoms.